Try changing

public DataSet GetReceiptByPKForPrint(Guid receiptPK)
        {
            return this.GetDataSet("ReceiptsSelectByPKForPrint",
                this.CreateParameter("@ReceiptPK", receiptPK));
        }

to

public DataSet GetReceiptByPKForPrint(Guid receiptPK)
        {
            DataSet ds = new DataSet();
            ds.EnforceConstraints = false;
            
            this.FillDataSet(ds, "ReceiptsSelectByPKForPrint", CommandType.StoredProcedure, this.CreateParameter("@ReceiptPK", receiptPK));

            this.DataSet = ds;

            return this.DataSet;
        }

I believe GetDataSet creates a new dataset on retrieval, which causes you to lose the setting of EnforceConstraints. FillDataSet uses an existing dataset, so the setting is preserved.